18257244 has 24 divisors (see below), whose sum is σ = 43507968. Its totient is φ = 5956080.

The previous prime is 18257207. The next prime is 18257249. The reversal of 18257244 is 44275281.

It is a super-4 number, since 4×18257244⁴ (a number of 30 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18257249) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15622 + ... + 16749.

It is an arithmetic number, because the mean of its divisors is an integer number (1812832).

Almost surely, 2^18257244 is an apocalyptic number.

It is an amenable number.

18257244 is an abundant number, since it is smaller than the sum of its proper divisors (25250724).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18257244 is a wasteful number, since it uses less digits than its factorization.

18257244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32425 (or 32423 counting only the distinct ones).

The product of its digits is 17920, while the sum is 33.

The square root of 18257244 is about 4272.8496346115. The cubic root of 18257244 is about 263.3167017572.

The spelling of 18257244 in words is "eighteen million, two hundred fifty-seven thousand, two hundred forty-four".